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All SEO tools

6 free utilities for checking how a page will appear in search, what crawlers are allowed to do, and whether the copy is readable. All of them run in your browser.

Which tool do I need?

• About to publish a page? Start with the SERP Preview, then generate the tags with the Meta Tag Generator.
• Pages missing from Google? Test your rules with the robots.txt Tester before assuming anything else is wrong.
• Cleaning up page structure? The Heading Structure Analyzer builds the outline and flags what is broken.
• Checking whether the copy says what you think it says? Use Keyword Density for topic terms and Readability Score for sentence load.

All tools

What these tools will not do

They do not fetch your live site. Crawling a live URL from a browser is blocked by cross-origin rules, and a client-side tool that could bypass that would be a security problem rather than a feature. Everything here works on text you paste in.

They also do not produce a single SEO score. A number out of 100 tells you nothing about which line to change; these tools point at the specific rule, heading or sentence instead. That is a deliberate choice, not a missing feature.

Why they run in your browser

Most tools in this category ask you to paste a URL, then crawl your site from their servers and email you a report. That model has two costs people rarely weigh up: your unpublished page copy and your staging configuration pass through someone else's infrastructure, and you wait for a crawl even when you only wanted to check one line of one file.

Everything here takes the opposite approach. You paste the text you want checked and the analysis runs locally. There is no queue, no account, no email gate, and nothing to wait for. The trade-off is real and worth stating plainly: these tools cannot see your live site, so they answer "is this correct?" rather than "is my site correct?".

A reasonable order to work in

If you are about to publish a page, start with the SERP Preview to see whether your title and description survive truncation, then generate the matching tags with the Meta Tag Generator. Those two catch the problems that cost clicks.

If a page is missing from search results entirely, check the robots.txt Tester before anything else. A blocked path is the most common cause and the fastest to confirm or rule out — and it is invisible in every other diagnostic, because a blocked URL simply never appears.

Once the page is reachable and titled, move to substance. The Heading Structure Analyzer tells you whether the page has an outline at all, Keyword Density tells you what it is actually about, and Readability Score tells you whether people will finish it. Those three are about the writing, and the writing is what ranks.

Accuracy, and where it stops

The robots.txt tester implements the longest-match rule from RFC 9309, including wildcard and end-anchor patterns. It is not a replacement for the tester in Search Console, which has access to Google's real crawl behaviour, but it answers "which of my rules is doing this?" in about two seconds instead of a round trip.

The SERP preview measures rendered pixel width using the font stack and sizes Google uses on desktop results. It is accurate enough to tell you a snippet will be cut and roughly where; it is not a promise about what Google will display, because Google rewrites descriptions from page content more often than most people realise.

Where a measurement is approximate, the page says so. A tool that hides its error bars is worse than one that admits them.